Handpiece for dental machines.



W. T. LYON.

HANDPIECE FOR DENTAL MACHINES. APPLICATION FILED OCT. 29, I9I4. RENEWED AUG-9.1916.

PaIenIed Nov. 21, 1916.

lUNITED STATES PATENT OFFICE.

WILLIAM T. LYON, 0F PORTLAND, OREGON.

HANDPIECE FOR DENTAL MACHINES.

Specification of Letters Patent.

Patented Nov. 21, 1916.

Application filed October 29, 1914, Serial No. 869,296. Renewed August 9, 1916. Serial No. 114,068.

To all 'whom it may concer-n Be it known that I, ViLLanM T. LYON, residing at Portland, in the county of lffultnomah and State of Oregon, have invented certain new and useful Improvements in Handpieces for Dental Machines, of which the following is a specification.

The present invention relates to an improved hand piece for dental machines of the type disclosed in my Patent #987782 issued March 28, 1911, and in its generic nature, my invention embodies an improved construction of parts designed to reduce the cost of manufacture and to render the device more effective in its operation.

The present invention is a modification of the invention disclosed in my co-pending application filed September 15, 1914, Serial #861,861, and in its more detail nature includes those novel features of construction, combination and arrangement of parts, all of which will be rst fully described, then be specifically pointed out in the appended claims and illustrated in the accompanying drawing, in which:y

Figure 1 is a perspective view illustrating the invention in use. Fig. 2 is a vertical section and part elevation of the invention. Fig. 3 is an enlarged vertical section of the rear end of the hand piece. Fig. 4 is an enlarged. vertical section of 'the front or chuck end of the hand piece. Figs. 5 and 6 are cross sections on the line 5-5 and 6 6 0f Fig. 3. v

In the drawing, in which like numerals and letters of reference indicate like parts in all of the figures, 1 represents the outer casing which is coned at its forward end, as at 2, and is providedwith a nib 3 for convenience in securing angle attachments (not shown). The casing 1 is bored'near its inneil end to receive a screw 5 by which it is fastened to the bearing member 7, into which bearing member thescrew 5 is tapped. The bearing member 7 is recessed to receive a latch 6 which has a lug 6a that projects through a slot 4 in the casing 1 and it also has a clutch lug 6b to project into one'of a series of slots 12in the rear end of the hollow shaft 8. The hollow shaft 8 has a collater appear, so that rotation of the rod 27 can be effected by turning` the sleeve 14. The sleeve 14'has an annular groove 23 to receive the latch lug 6 when the clutch end' Gb of the latch is to be withdrawn from the clutch slots 12 (see Fig. 2).

The front end of the hollow shaft 8 is internally coned as indicated, to coperate with the split fingers 24 of the chuck 25. The chuck 25 is held within the hollow shaft and is adapted to receive the tool 26.

The rod 27 abuts the chuck 25 and has a threaded engagement' as at 28 .with-the hol- Y low shaft 8, so that by'turning the rod 27,

with relation to the hollow shaft :8, the

chuck 25 can be forced to its gripping po-' sition, or released, as desired.

When the parts are positioned, as shown in Fig. 2, with the shiftable sleeve 14 retracted, the rotary drive shaft 16 will impart a turningmotion to the rod 27 and sleeve 8 to rotate'the drill. In order to release the drill chuck' 25 fromy its gripping action, the sleeve 14 is held forwardly, thus causing the'clutchlugb' to engage any one of the clutch elements 12 and lock the hollow shaft from rotation, and at the same time Vthe clutch elements 30e-21 are brought into engagement so that by turning' the sleeve 14 in vone direction, the rod 27 can be unthreaded to release ktension on the chuck andconversely. turningA the sleeve 14 in the .other direction threads the rod 27 into the hollow shaft 8 to force the chuck 25 to its tool gripping position.

The rod 27 is held in' a relatively Xed positionA with relation'to the bearing 20 by collars 29. A VVhilethe outer casing 1 is shown with lits frontend as a separate section (see Fig. 4) the parts numbered 1 and'2 in Fig. 4, are preferably permanently united by braisingor in any other suitable way, thesame not forming, per se, a part of the present invention.

From the foregoing description taken in connection with the accompanying drawings, it is thought the construction and advantages of my invention will be readily understood by those skilled in the art to which the invention appertains.

That I claim is:

l. In a dental hand piece, a bearing member, an outer shell or casing secured thereto and having a tool opening in its front end, a hollow shaft rotatable in said shell and projecting through said bearing, said hollow shaft having its outer end internally coned and apertured to rece'ive the tool, a chuck in said hollow shaft adjacent to said coned end, a thrust rod in said hollow shaft, a threaded connection between said thrust rod and said hollow shaft, a flexible drive shaft connected to said thrust rod for effecting driving rotation of the same, means for holding said hollow shaft from rotation and means for engaging said thrust rod, said last named means being rotatably mounted Wwhereby said thrust rod may be turned to secure or release the chuck.

2. In a dental hand piece, a bearing member, a casing in which said bearing member is mounted, a hollow shaft mounted in said casing and projecting through said bearing member, a tool chuck in said hollow shaft, a thrust rod for operating said tool chuck, a threaded connection between said thrust rod and said hollow shaft, whereby said thrust rod may be longitudinally moved within said hollow shaft, ai latch device for latching said hollow shaft to said bearing at times to prevent rotation of said hollow shaft, said latch device lying normally out of action, means for imparting rotation to said thrust rod and thereby rotate said thrust-rod and said hollow shaft7 and a shiftable sleeve mounted on said casing and adapted to engage said latch member whereby when said sleeve is shifted in one direction said latch member will be forced to its latching position.

3. In a dental hand piece, a bearing member, a casing in which said bearing member is mounted, a hollow shaft mounted in said casing and projecting through said bearing member, a tool chuck in said hollow shaft, a thrust rod for operating said tool chuck, a threaded connection between said thrust rod and said hollow shaft, whereby said thrust rod may be longitudinally moved within said hollow shaft, a latch device for latching said hollow shaft to saidV bearing at times to prevent rotation of said hollow shaft, said latch device lying normally out of action, means for imparting rotation to said thrust rod and thereby rotate said thrust rod and said hollow shaft, a shiftable sleeve mounted on said casing and adapted to engage said latch member whereby when said sleeve is shifted in one direction said latch member will be forced to its latching position, said thrust rod and said shiftable sleeve having cooperating clutch elements adapted to be brought into and out of engagement with one another whereby when said clutch elements are in engagement and said latch is in its latching position, said thrust rod can be turned with relation to said casing to secure or release said chuck.

et. In a dental hand piece, a casing, a hollow shaft rotatably mounted in said casing, a latch device relatively fiXedly located with relation to said casing, a chuck mounted in said hollow shaft1 a thrust rod in said hollow shaft, a threaded connection between said thrust rod and said hollow shaft for imparting thrust movements to said rod,

said hollow shaft having a slot, said latch having a clutch lug to engage in said slot when said latch is depressed, a shiftable sleeve mounted on said casing, a cooperative connection between said sleeve and said latch whereby said latch will normally lie out of its latching position and upon shifting said sleeve, said latch will be forced into its latching position, and means for imparting rotation to said thrust rod.

5, In a dental hand piece, a casing, a hollow shaft rotatably mounted in said ca sing, a latch devicerelatively fiXedly located with relation to said casing, a chuck mounted in said hollow shaft, a thrust rod in said hollow shaft, a threaded connection between said thrust rod and said hollow shaft for imparting thrust movements to said. rod, said hollow shaft having a slot, said latch having a clutch lug to engage in said slot when said latch is depressed, a shiftable sleeve mounts ed on said casing, a cooperative connection between said sleeve and said latch whereby said latch will normally lie out of its latching position and upon shifting said sleeve said latch will be forced into its latching position, means for imparting rotation to said thrust rod, said thrust rod having a bearing portion to which said rotation imparting means is attached, a bearing forV receiving said bearing portion, said bearing having a projection on-which said sleeve is also slidable, said sleeve and said thrust rod having cooperating clutch elements adapted to be brought into and out of engagement with one another whereby when said elements are in engagement and said latch is depressed, said thrust rod may be turned i to move said chuck into its clutching or tool VILLIAM T. LYON,

lVitnesses ARTHUR H. Lnwrs, A. T. Lewis.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of IEatents, Washington, D. C. 

